Basslink outage (2015-2016)
Basslink, the existing 500 MW undersea cable connecting Tasmania to Victoria, went offline in December 2015 after a fault. The outage lasted about six months, forcing Tasmania to rely on its own hydro generation during a drought and import diesel power.
Tasmania faced energy shortages and had to run emergency diesel generation to keep the lights on.
The outage exposed Tasmania's vulnerability as an island grid with a single connection to the mainland, strengthening the case for a second interconnector.
Marinus Link is that second interconnector. It gives Tasmania redundancy if Basslink fails again and adds export capacity for its hydro and wind resources.
